Interior view of a Separett composting toilet showing the fan and markings for potential drill holes, with the top of the waste compartment visible.

I have purchased a simple separett for my small summer cottage. It is prepared for installation with a ventilation fan through the back of the toilet through the facade (wood) and for urine through the bottom of the toilet. Unfortunately, I can't use the conical elevation at the bottom because the drain I'm installing the toilet over is about 15 cm further back. So, I need to drill a hole in the plastic where it's not intended to be drilled. I have test-drilled in some plastic items with the drill I bought, which can be set to the required size, but the plastic always cracks in a star pattern around the drill hole. It's possible that the sanitary plastic doesn't behave this way, but I only have "one shot." Any tips on how to avoid this? Is there "cutting oil" for drilling plastic? Or is the tension of covering the area with duct tape before drilling enough? Grateful for tips from those who have done something similar.
 
How big of a hole are we talking about?
There is a wood bit with a tip that is better than a metal bit for drilling in plastic.
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Use one of these and don't press too hard.
Jula has up to 12 mm. If the hole needs to be larger, you can file it with a round file.
 
Adjustable drills are rarely good for anything at all...

For a large hole, a hole saw works well on plastic...
 
A hole saw works best for plastic if you need to drill a large hole, the adjustable ones work in gypsum and wood.
 
You can use a stegborr
 
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Another solution is to place the mug on a small elevation. This way, you have space for a couple of drain bends underneath.
 
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