Slide Shows

 

• The making of the shot glass (14/04/07)

• Designing the Mk 1.1 AEM extruder's polymer pump

Pictures

 

Successful resolution of the perimeter mismatch problem on Tommelise prints. It turned out that I was turning off the counting of shaft encoder pulses before the gearmotor had stopped turning.

 

 

Tommelise rollout complete with a tested and operational Mk 2.1 extruder mounted ready for testing.

 

 

First test squares of HDPE extruded by Tommelise's Mk 2.1 FDM extruder onto a smooth poplar plank.

 

 

Prototype single board controller for Tommelise built around a PIC 18F4610 microcontroller (the big one in the middle). The pseudostepping gearmotors used on Tommelise are powered by two Texas Instruments 754410 dual darlington chips (at the bottom of the board). The big heatsink on the right-hand side of the board is attached to the power transistor that provides current to the Mk 1 AEM extruder barrel heater. It's mostly there for show. The power transistor stays very cool even though it is operating at full capacity.

 

 

Detail of the Mk 1.0 AEM extruder mounted on the xz positioning table of Tommelise

 

 

Lashup infra-red altimeter mounted on the xz extruder positioning stage to map the xy working surface slope (if any)

 

 

Tommelise cartesian positioning system with pen mounted for testing the positioning commands and the PC/microcontroller interface