It’s not that easy as it may sound to find paper rolls for a 30 years old printer, the Sharp CE-150. The printer is used in combination with a Sharp PC-1500/1500A pocket computer.
I’ve looked at my small amount of paper rolls, the leftovers I’ve found in a box on the attic. Interestingly they were differing in size (can’t remember why):
|(Left to Right)||Core Diameter||Tube Diameter||Outer Diameter||Width|
|Roll 1||7.7 mm||14.7 mm||28.5 mm||57.4 mm|
|Roll 2||8.3 mm||13.0 mm||29.3 mm||57.6 mm|
|Roll 3||11.1 mm||17.0 mm||33.0 mm||58.7 mm|
|Roll 4||9.7 mm||-||19.7 mm||58.3|
Their width and outer diameters did not differ significantly, but the core diameters did. Paper rolls with core diameters of 7-9 mm are hard to get, the rolls sold today mostly have a diameter of 12 mm. I’ve successfully tested thermal (yes: thermal) paper rolls with this diameter in the CE-150, and these are really cheap to get (e.g. on eBay Germany). The ink doesn’t run, but there might be paper rolls with different coatings. I did not check that.
Maybe as a warning: Thermal papers mostly contain Bisphenol A (BPA), a substance that exhibits hormone-like properties!
The approximate dimensions you should look for are:
Width: 57 mm; Inner / outer diameter: 12 / 30 mm; Length: 10 m