Hey I made this little Cat toy designed for printing in a TPU/Flexible material that has a mouse toy with an integral elastic band.  If you're used to working with tpu it is easy to print if you're not familiar with tpu's expect to slow your print down and get something with a high durometer like 85A to 95A range.  I printed mine on a room temperature bed.  Try different durometer materials and varying the infill and wall thickness to get different results. Please wash the toy with warm soap and water and dry when you take it off the printer to get anything that may have been on the bed surface such as glue or other residue.  I hope you like it.