Brio / IKEA train to Duplo adapters (minimal material design)

thingiverse

Even though I posted it as a remix, I designed it completely from scratch since the original (and any others I found on Thingiverse) seemed to be too excessive in material usage and not fully compatible with most rails. Here are the improvements made in my design: - Compatible with Brio and (!) IKEA (and likely most other similar train sets) - Reduced material usage by about 50% and faster print times almost twice as fast while maintaining the same functionality - Based on a 2x2 Duplo brick instead of a 2x4, offering more flexibility, and all parts except end-pieces can still accommodate a 2x4 - Rail depth reduced to 2.5mm (instead of 3mm), significantly improving wheel traction (a long story with many experiments, now working flawlessly) I even experimented with using a Duplo buildplate and created two versions for the climbing slope to enable seamless bridging between Duplo columns: - V1: Minimal material design, but cannot bridge 2 columns fixed on a Duplo buildplate due to being one-half pin too short - V2: Half a Duplo pin longer, allowing for bridging 2 columns on one plate Of course, this can still depend on the brand and length of straight connector used, but one of the two versions should work either way.