Have all of your 20mm and 25mm square based models been invalidated by rule set changes? Are you changing rulesets to a skirmish based system? Are you staring down the barrel of having to re-base 10's if not 100's of models? Well fret no more. These base converters clip onto your existing 20mm or 25mm square bases, turning them into 25 mm rounds or 32mm rounds. Ok enough with the smarmy plug.
These converters have been specifically designed for GW Citadel bases. It is not without its drawbacks, for example, you can see from the photos that the corners of a 20mm square base (approx 27mm on the diagonal) protrude from the perimeter of the 25mm round*. These 'ears' are stick out about 1.5mm and thus the converter may not suit the purist.
25mm square to 32mm round and 25mm x 50mm rectangular to 60mm x 35mm ovals have been added.
2019-02-05 Update: Added - 40mm square to 50mm round; 50mm square to 60mm round; 50x100 rectangular to 70x105 Oval; 50x100 rectangular to 95x120 Oval; 60x100 rectangular to 95x120 Oval.
Also added 48x100 rectangular to 70x105 Oval; 48x100 rectangular to 95x120 Oval as the "50mmx100mm" rectangular base I had from GW was actually 48mm wide not 50mm.
2019-02-18 Update: Added 50mm square to 70x105 Oval converter. Prints in two pieces, the smaller piece slides in to lock the model in place.
*Note: The movement trays that accommodate the 20mm converters can be found here:
I found that my bases printed best when using a brim as I get better bed adhesion and quality of 1st layer using that setting. I found that printing direct on the print bed using no raft or just a skirt resulted in a weaker 1st layer that sometimes separated when bending the converter to clip onto the base.
Printing with a brim
Printing with a brim means that it needs to be cut off the base before use. High quality 1st layer without brim makes post print cleanup unnecessary.