Electronics

Tested the photo diode sensors on Version 15 and was not seeing a high enough voltage  for the ESP8266 to get the high input. Decided to run the the resistor before the sensor instead of after. Breadboarding it showed promise and so I redid the board. I also had the wrong pitch on the motor connectors so I changed it from 1.25 pitch to 1.5 mm pitch. OSH Park set a notice that they are shipping so I need to get the rest of the changes implemented.

Acrylic laser cut parts

Our laser seems to be losing a little steam. Unfortunately everything was dialed in for 10mm/s and 80%. I need to find the new sweet spot. The  areas of poor fit from V15 that I will fix and release a new dxf are as follows:

1) Shaft fit for the motor gear and space was too tight. Add a 0.1 negative sew compensation to see if it helps.

2) Make the board holder z height line to line instead of the 0.3mm clearance.

Lastly, I still have not figured out how to manage the laser cut files well. I like to modify in Fusion 360 because the push pull feature is cool, even if there is no design history. However, they can not output a full assembly drawing to a DXF. It can output an individual sketch in DXF but I want to keep the relative spacing for he assembly.

So the workflow is to make the adjustments in Fusion and then expect the Step file. Import it to Onshape, make a drawing and then export the DXF.  Here is the link.

https://cad.onshape.com/documents/1c2d980ca88632e4dcfe4f4f/w/460478a37bb41d6a13b297e6/e/00069ebaddfc90c36c1fcfa5

Grommets

The tatoo grommets I used for feet are awesome. I tried to replace the drive gear clip with them and it seams to be working very well. This will be one of the main none electronics parts. 

https://www.amazon.com/Rosenice-Tattoo-Needle-Machine-Grommets/dp/B01M6C4BGM/ref=pd_cp_194_1?pd_rd_w=EJs04&pf_rd_p=ef4dc990-a9ca-4945-ae0b-f8d549198ed6&pf_rd_r=47ARD8MJDVQ1JHYD17DP&pd_rd_r=864243a9-31fc-11e9-8f94-b51658e5fe33&pd_rd_wg=3adQl&pd_rd_i=B01M6C4BGM&psc=1&refRID=47ARD8MJDVQ1JHYD17DP

or Allexpress

https://www.aliexpress.com/item/100pcs-Tattoo-Gun-Needle-Machine-Grommets-A-Bar-Nipple-Supply-Tattoo-Needle-Pad-For-Tattoo-Tip/32828049951.html?spm=2114.10010108.1000014.1.5e162492fDsigo&gps-id=pcDetailBottomMoreOtherSeller&scm=1007.13338.112237.000000000000000&scm_id=1007.13338.112237.000000000000000&scm-url=1007.13338.112237.000000000000000&pvid=b06b7e1f-eff2-46b7-8d09-a39947a76223

The new axle/gear holders are working great. We just reverted our Prusa MK2.5S to direct drive so I hope the holes do not get filed in like last time. The shape is perfect though so I hope I the print better.