Friday, Nov 9 2018
Raspberry Pi mount
A couple of days ago I printed a holder for the Raspberry Pi that runs Octopi/Octoprint printer control software. I got tired of having the unit sit where it was easily knocked around. The holder was supposed to be a test print; a proof of concept that would drive the final design. I never printed the final design. The proof of concept worked well enough once I drilled/filed out a slot for the power plug.
Stringing/Retraction test
Today I printed this piece to check my retraction settings. I was planning on printing several iterations, varying the retraction amount and speed. Although the picture makes things look pretty bad, it actually is not bad at all. 10-15 seconds with a heat gun got rid of all the fine, hair like wisps of plastic. I’m going to leave well enough alone and keep using my current settings of 3 mm retraction at 60 mm/s.
These are some of the test pieces I printed to dial in the settings for Prusament PLA filament. This color is Prusa Galaxy Black. It prints well. It also shows my printer is fairly well dialed in.
Printing with 0.2mm layer height at 60 mm/s perimeters, 50 mm/s external perimeters, and 100 mm/s infil. Travel is at 180 mm/s.
- prints best on my printer at an indicated 215 °C. First layer printed at 220 °C.
- 65% overhangs without needing supports.
- Bridging OK to 40 mm, 50 mm in a pinch. At 60 mm the underhang is quite noticeable.
- The XYZ Calibration cube is within 0.04mm on all sides. The slight ringing on the right side of the Y in the photo can barely be noticed on the part until I break out a magnifying glass.
- The negative space test let me remove all of the pins with a clearance of 0.3 mm or more. The pin with 0.2 mm clearance, however, is not moving.