Topre/EC Switch Display v2

Topre switch display structure

Finish with picture box, resin cast

Materials

• Topre switch parts

• Transparent PETG filament or 14 gauge wire

• Drill bit 5/64 inch

• Scrap clear plastic (any flat blister pack is fine)

• UV glue

Wire prep

Cut piece transparent PETG filament 

To straighten filament 

Boil a piece in water pull out with pliers. Quickly hold between two sets of pliers let cool for one minute cut excess.

Tip
Cut the filament longer than needed
Make a few keep the best one

Stacking

1. PCB cut down to size sand edges drill center hole 

2. Spring

3. Slider drill center hole using alignment jig

4. Dome puncture center hole with a needle

5. Housing cut piece of clear plastic into small square, glue to the inside bottom, drill center hole using alignment jig

6. Plate cut piece of clear plastic into small square, drill center hole using alignment jig

7. Keycap

Stacking Tips
Use UV glue between parts and wire
Use masking tape on the outside of the stack to keep it from falling as it is being built up

Resin cast

1. Print a box

   1. https://makerworld.com/en/models/250823-parametric-silicone-mould-frame-template#profileId-267151

   2. 32mmx32mmx110mm

   3. Horizontal opening is easier to cast, vertical is challenging with bubbles

2. Apply clear packing tape to inside

3. Use 100% Silicone to seal box

4. Print alignment piece attach to top of the box

5. Suspend Topre display like a candle wick

6. Pour resin 

7. Let resin dry

8. Disassemble box

9. Sand / finish

Resin Cast Tips

Make sure all UV glue is dry prior to resin pour or it will leave defects
Car lens cleaner and drill work well to get crystal clear finish