An underground tunnel placed in the corner of your tank where your fish can hide while you can watch them.
Burry the tunnel under your aquarium soil or gravel and let your fish explore it.
All the edges are rounded to protect you fishes' fins. With dimensions of 140mm x 140mm and a 37mm roof height, (50mm overall height, including the entrance). The entries are 30mm x 40mm. The plastic thickness is 3mm.
Materials: Pick materials that are safe for both your fish and plants. It's usually recommended to use ABS or specific food-safe PLA, and it's often advised to coat the print in a safe epoxy to seal it.
To legally sell PRINTED models, you may obtain my permission through this link:
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.