Printed in PETG with my low budget Prusa i3. PETG has a higher melting point than PLA and a better layer adhesion than ABS, but has some other challenges (printing speed is important, retract not so good as PLA or ABS).
By printing this lamp, I got not only a wonderful lamp in the end, but I also earned some more experiences about printing with PETG. In the beginning I had a lot of retract problems with PETG (too much retraction result in clogging of the nozzle, lower retraction lead to spider webs and rough walls), which are still not completely solved (my clogging problem could be solved with some oil in my dust filter for the filament - sounds weird, but it works!). Thus I printed only one part at once with a a spiralized outer contour (CURA setting "Joris"), which has only one shell. Since PETG is very strong (e.g. I can bend the blades over 90° without any crack or plastic deformation) one shell is stable enough. By printing in this way you spend some material (one blade is under 10g) and the outer surface is very smooth (also with my low budget printer).
Another problem by printing those blades with PETG is the changing speed. PETG don't like changing printing speeds, but CURA (or any other slicing program) reduce the printing speed to archive the minimal layer time for cooling, when the blade is getting more narrow. When the printing speed is too low (under 30 mm/s) the flow of PETG is getting unstable, which results to holes in the print (see picture). To avoid this, I set the minimum printing speed to 25 mm/s and fan on (increasing from 0% to 80%).
Just the blades were a bit challenging. The two parts of the base were easy to print. Since I don't like to see holes at the side of the blade base, I also printed a fitted ring for the base, which holds the mounting base and blade base together (another reason is, because the tabs on my printed blade base are already broken :) ).
Many thanks to smallnetd for this great design, and also thanks to 3desarrollo for the good idea combining white and orange blades!
Printer settings for the blades in PETG:
- one shell!!! (in CURA settings: "spiralize the outer contour" aka "Joris")
- shell thickness = nozzle diameter 0.4 mm
- layer thickness 0.15 mm
- no infill
- bottom 1.2 mm
- brim 10
- normal speed 60 mm/s
- minimum speed 25 mm/s
- minimal layer time (for cooling) 4 s
- fan on (min 0%; max 80%)