Yet another temperature tower

thingiverse

Aug 26 2020: Added a pic of carbon fiber polycarbonate that was vacuum dried for 24 hours at 10Pa (pascal). The bottom bridge is printed at 260C reducing in 5C steps. Printed on a heated bed at 150C. Tested the tower by squeezing with needle nose pliers to destruction. The print is brittle at cooler temperatures but still looks fine. At 260-250C the thin walled print is tough. Hollow spline surface on one side and half a thread inside and outside on the other. 45 and 30 degree overhangs connect to the bridge. Bridge front bottom edge is square, bridge back bottom edge is a 45 degree chamfer. The top of each bridge is a multiple of 5 mm from the build surface. I reduce the temperature 5C at the bridge top. PETG filament in pic printed on a heated PEI sheet at 85C tower starts at 255C. For me the spline having a smooth glossy surface is the most important criterion indicating layer strength (you can see the min and max temperatures in the surface gloss and you have some temperature wiggle room), second is the thread geometry outside and inside and last is the bridge and the whiskers. Spoiler alert: you rarely get a temperature that gives you everything you want. Designed in fusion 360 and printed on a Duet2 Cetus conversion with lots of mods. Have fun -Peter