Thursday, June 8, 2017

Affordable Belay Glasses

Belay glasses have been on the market for few years now typically floating near the $100 price point. These glasses use prisms to direct your sight 90 degrees upward so you can belay without getting a sore neck. Very convenient,

Curiously, lying down or MRI glasses have been around longer. These glasses direct your vision downward so you can lay on your back with your head flat and read a book without tiring your arms out. Also convenient. These have been priced between $10 and $20 dollars.

I actually purchased a pair of the MRI glasses hoping I could turn them around for belaying. This did not work out too well so I harvested the prisms and 3D printed reversed frames. This worked out ok but I figured i was only a matter of time before the manufacturers caught on and the price of the look up glasses would approach the price of the look down glasses.

Well, folks. That time is now. Amazon is currently selling 5 different pairs of belay glasses between $10 and $30.

The cheapest are only $9.90 but have poor reviews.

The Epic Peak Light Weight glasses have the best reviews and are currently priced at $18.99 with a case or $20.99 for case + neckstrap.



I can' t wait to try these out.

Check out my Climbing Shoppe  for these and other curated climbing gear available on Amazon.

Cheers!

Thursday, March 31, 2016

Solidoodle is belly up. These are your support options


I was sorry to see that Sam shut down Solidoodle on March 28th. Here is the announcement. http://www.solidoodle.com/blog.html

Seems like some of the solidoodle related sites went dark as well. In a scramble to capture as much info about these machines as possible I started checking related links.

As of today these are still active.

http://wiki.solidoodle.com/
http://www.soliforum.com/

I think the soliwiki is independently run so this should be around for a while.
http://www.soliwiki.com/

Software mirrors are here:
And the old software package, the All In One Pronterface+Skeinforge
Windows http://www.soliforum.com/downloads/soli … io_4.3.exe
SoliPrint v1.4.0 Does this even exist? Let me know in the comments.


Link list for other helpful sites:

Tuesday, March 31, 2015

Solidoodle Workbench Instructions


I purchased a Solidoodle Workbench 3D printer. It comes with very little instruction and not much step by step help online. Here's my attempt at a step by step instruction set based on my trials and errors. I don't work for Solidoodle, use these instructions at your own risk.

1. Unpack it carefully
- Place it on a solid table, desk, counter or workbench. It should reside on something that doesn't wobble around when you bump it.
- Remove tape and zip ties.
- Remove yellow shipping brackets from the rails.

2. Assembly
- Clip the glass plate to the aluminum bed using the binder clips. I have used 4 clips. One on each side, placed about 2 inches counter clockwise from each corner.
- Remove the top silver tabs from the clips to reduce the chances of the extruder hitting them during calibration and homing activities.
- Use the wingnuts under the print bed to visually level the printbed.  It does not have to be perfectly level. Do not bottom out the springs by fully compressing them.
- Insert filament holder brackets into the appropriate holes on the back of the Workbench. Insert piece of supplied PVC pipe into filament rolls and place pipe onto the brackets.
- The end of the filament can be fed into the holes near the top of the rear of the Workbench case.

3. Lubricate 
- Lubricate all rails and z-axis screw drive with 3 in 1 (sewing machine) oil if they are dry.  Solidoodle recommends using lithium grease. I've tried both. I think the 3 in 1 oil provides better lubrication but may have to be applied more often.

4. Belt Tensioning
Don't skip this step. Chances are the Y-axis is out of alignment due to packing, shipping, unpacking, handling etc. Follow these Belt tensioning instructions before even turning it on. The pulleys on the workbench us a 2 mm hex key as opposed to the 1.5 mm mentioned in the instructions.

5. Power up
- Find an old computer power cord to plug into the power supply.
- Plug power cord into power supply and plug into wall.
- Plug both power supply cables into the printer. .

6. Connect to printer
- Plug printer into computer with USB cable.
- You may need to install this driver for windows. Details pertaining to driver installation are here.

7. Software
- Download and install the Repetier Host Solidoodle software.
As of 4/1/2015, Soliprint does not work with the Workbench model. 
- If you have problems with the software quitting unexpectedly, you may need to install this particular version of the arial font. 
- Other troubleshooting tips can be found on the repetier website.
- Launch Repetier-Host Solidoodle. Select Solidoodle Workbench from the Connect dropdown menu. If successful, it should say connected on the bottom left of the screen.

8. Calibration
- Go to the Manual Control tab.
- Click the Home X and Home Y buttons so the printer can find the endstops for self calibration.
- Use  the -X and -Y arrows to move the printhead toward the center of the bed.
- IMPORTANT: Push down Solitouch probe on right side of printhead so it extends below the print nozzles.
- Click Home Z. The printer will lower and then raise the print bed until it touches the probe.
- Now you should be able to move the print head and bed by clicking the arrows.
- Solitouch bed measurement is part of the printing process and will take place before each print.

9. Heat up the bed and the extruders
- Click Heat Extruder and Heat Printbed on the Manual Control tab.
  For ABS I have been using 215°C for the extruder and 100° for the bed.
  For PLA I have been using 200°C for the extruder and 70° for the bed.
 - At these temperatures and with using a light coating of Aquanet hairspray on the glass, I have had no problems with getting the first layers to stick.

10. Level the Bed
- Solitouch bed measurement is part of the printing process and will take place before each print. however starting with a reasonably leveled bed will produce more consistent results.
- Use the thumbscrews under the bed to adjust the bed height. Level is a bit of a misnomer because level with respect to Earths gravity is not as important as making sure the plain of the printbed is parallel to the plain that the printhead travels in.

I've found a good way to do this is as follows:
  1. Twist the thumb screws clockwise as much as possible to lower the glass as close to the z-carriage as you can reasonable get. 
  2. HOME the Z-axis with the printhead near the center of the bed. Make sure the solilouch probe is in the down position before homing. 
  3. Manually lower the printbed a few millimeters. 
  4. Move the printhead so the solitouch probe is close to a thumb screw.
  5. Turn the thumbscrew counterclockwise until the bed contacts the switch on the probe.
  6. Manually move the printhead probe to the next thumbscrew and again, raise the bed with the thumbscrew until contact is made with the probe.
  7. Repeat this for the final 2 thumbscrews, then repeat it a second time for each thumbscrew.
- Soilitouch uses a programmed distance between the probe and the printhead using the M851 command. My Workbench's default value is 7.0mm. I've found that this is way too much and first layers of prints fail because the printhead ends up too close to the bed, squishing the extrudate or blocking it from flowing altogether. I've had much better luck using a value of 6.0mm which can be changed by typing M851 z6.0 in the Gcode spot on the manual control tab in Reptier-Host. Unfortunately this adjustment does not stick. It will revert back to the default so check it prior to each print job.

10. Load Filament

- Once the extruder comes up to temperature, click the Retract button a few times to remove the piece of filament left in during shipping.
- Clip off the end of the filament you are going to load if there isn't a clean break.
- Push filament in the hole while clicking the Extrude button.You may have to click a few times until the extruder catches the filament and it starts to self feed.
- Continue clicking the extrude button until the new color of filament comes out of the extruder.
- Use tweezers or a scraper to remove extruded filament from the nozzle.

11. Load STL Model
- Choose an STL model from the the Solidoodles website, Thingiverse or one of your own. My first print was this calibration cube. It's simple and only take about 20 minutes to print.
- From the Object Placement tab, click Add Object and select your STL file.
- Click the Slicer tab.
  - Click Active under Slic3r
  - Select print setting (0.1, 0.2 or 0.3)
  - Printer Setting should be Solidoodle Workbench
  - Extruder Settings should be Solidoodle 1.75
  - Click Slice with Slic3r.

12. Printing
 - I spray a light coat of Aquanet hairspray on the glass print bed to aid with sticking. Aim the hairspray away from motors and electronics. It has been reported that Elmers glue stick works well also, but I have not tried that yet.
 - Check that extruder and printbed are up to temperature.
 - Make sure Solitouch probe on the right side of the prinhead is in the down position.
 - Click Run Job.
The Workbench printhead will move to from the north east corner to the southwest corner and pause.  - Click Continue Printing
The Workbench will go through the Solitouch bed measuring. Mine measures 16 points. After measuring the last point, the bed will raise about 7mm and push the Solitouch probe up. It will then start printing your model. Sometimes the probe does not click up into place so keep an eye on it and give it a hand if needed. If the probe does not pop all the way up it may drag through the newly extruded material and ruin the print.

13. Problems during printing
Actions to take if things go wrong.

- The Emergency STOP button in Repetier-Host doesn't seem to do anything. Don't rely on it.

- PAUSE the print if you need to make a minor adjustment or temporarily interrupt the print for some reason. You can use Manual controls during a PAUSE and on resume your print will continue where it left off. You may even pause to change or reload filament.

- KILL the print if you need to start over from scratch. I usually do this if I don't like the way the first layer or two look or if there is a problem with sticking. When you kill a job the printer will finish the last command that was sent and then Home the printhead. REMEMBER when you kill a job, Repetier shuts down the heater on the bed and the extruder. You will have to turn them back on under the Manual Control and wait for them to reach their setpoints before restarting the job.

- PULL THE PLUG if you hear motors grinding, the printhead crashes into something, you see fire or the printer exhibits other self-destructive behaviors.

14. Post printing
When the print completes, the bed will lower, the printhead will return home and the extruder and printbed heater will shutoff.
 - Remove your model with the putty knife or a razor blade scraper.
 - Clean the glass off with the scraper or razor to get ready for your next print.
If everything went well you should be able to jump back to Step 9 to start the next print.

15. Optional Enclosure
To help with temperature stability and conserve some energy, consider enclosing the Workbench. Enclosures are often made with plexiglass acrylic which is transparent. Less expensive alternatives like cardboard or foamboard can also be used. Panels for the sides and front should be removable and can be fixed to the frame with magnets, tape or clips of some sort. I designed and printed a clip for this in Sketchup. For the top, I use 3 pieces of oversized overlapping foamboard resting on the frame. This allows the printhead to push them around as needed. If you want to fix the top to the frame you will have to design it as a dome so it does not interfere with the printhead.

Please add your own tips and comments from your Workbench experience.

Good Luck






Wednesday, May 21, 2014

How to Keep your audience awake during a 6.5 hour seminar

I've been recently hired to present a 6.5 hour seminar for architects and engineers. I two engagements for the same seminar. The topic is interesting enough for the audience. I have already presented one hour of the presentation for a previous gig. I have a skeleton outline for the rest.

Objectives:
1. Flesh out the outline with the facts that I need to get across.
2. Get this into some presentation software/platform.
3. Create content.
4. Make it interesting.

The general mo in the industry is show a table of contents, slog through the data/procedures/examples, then repeat in summary fashion what you just presented. I find this style tedious and boring to listen to. It's a tired style. I enjoy This American Life and TED talks. These contributors of content tell engaging stories.

Objectives 1, 2 and 3 I can handle. Numero 4 is the challenge.

I need to find the stories of shallow foundations.

to be continued...

Here are some articles I found with useful presentation tips.

http://hbr.org/2013/06/how-to-give-a-killer-presentation/ar/2

http://www.copyblogger.com/boring-topic-content-marketing/

Update March 31, 2015

I've given this presentation about 6 times and have received good reviews. Some things I have learned that work well:

- Approach the presentation as a dialogue with the audience. Keep it as interactive as practical. Ask questions. Answer questions. Don't be afraid to let the topic drift a little to cater to the audiences interests.

- Get to know your audience in the first hour and adjust your pacing and material based on their appetite.

- If you don't know the answer to a question from the audience, ask the audience for help. This encourages discussion and information exchange and everyone comes away with something more.

- Draw. I purposely have not included all of my figures, drawings, sketches in the powerpoint presentation. I draw at least 2 sketches per topic on a white board or flip chart using colored markers. This engages the audience, adds a small element of suspense, keeps me focused on the material and gives flexibility to address the topic from different angles.

- Review the material after the presentation. Adjust notes, slides, diagrams etc based on what worked well and what fell flat. Each time it gets better and easier.



Rayban Wayfarers Sink


Last Saturday I went on a bouldering at Haycock Mountain, near Nockamixon State Park, in Quakertown, PA. On the hike in, we crossed a creek. While skipping in between rocks I bobbled to keep my balance. The resulting jerk of my body launched my sunglasses off the top of my head into the roaring creek which was swollen from Friday's heavy rains. I made a quick personal inventory and decided to let them take the dive in order to keep myself from falling in, and ruining the iphone that was in my pocket. After helping the rest of our group across without further incident, I searched for them for about 30 minutes. The creek was moving swiftly but was not much more than a foot deep. The bottom was quite rocky. The big question I had was did the sunglasses sink or float? This answer would alter the scope of my search. 

A brief internet search from the phone was futile and I walked on, squinting and pondering the probability of a future successful search.

We returned to the creek about 4 hours later. The flow of the creek was only slightly less and still too turbulent to clearly see the bottom in the area where I dropped the shades. Bummed, I returned home, still squinting.

The rest of the weekend was dry and I had the opportunity to return to the creek Wednesday morning. There had been to significant precipitation since and betting that the heavy plastic frames would sink I returned to the crossing. The creek flow was only about a quarter of what it had been four days earlier. I spotted the shades about 2 feet from their point of entry within about 5 minutes of searching. Question answered. Wayfarers sink.