Toto K300 Bidet base plate bracket

Update (2026/07/01) - V3: I adjusted the V2 model to reduce the width of the screw holes so that the deeper portion of the model is continous. I had a print failure recently where the print split on the thinner portion. The screw hole is a bit narrow on this, as I think it's sized for original 5.8mm instead of my toilet's 6.25mm, but I just screwed through the plastic fine.

Update (2024/05/18) - V2: I added an adjusted model which both makes the model wider and deeper so it is stronger. Notaly, without a solid backing that meets the toilet the print will flex when tightening the screw. I believe this model also increases the hole for screws a bit to allow for my 6.25mm screws. The backing is rounded to better fit the edges of the possible bracket positions.

I recently picked up an open box bidet that was missing this assembly part. This part was for a Toto K300 (SW3036R) I received, modelled from the dimensions of the original bracket which I received one of.

According to the official Toto part list, this should correspond to the base plate assembly THU6050 which is listed as being compatible with the S500E/S550E (Elongated models) and K300. On the other hand, the base plate I have more closely matches the THU6537 pictures which is lised as only compatible with the W2 (SW3004).

I did not apply fillets to the interface with the base plate as it fit well on my first iteration. I ended up having to replace both brackets with 3D prints as I needed to use my original, larger, toilet seat screws rather than Toto's because of fixed nuts for the toilet seat.

The originally modelled dimensions worked fine as the the Toto screws were 5.8mm screws (incl threading), the base plate 6mm, while my toilet's screws were 6.25mm. The larger screws fit snuggly with the 3D print.