This top is not a crude model, but a well balanced "professional quality" machine.
It is a bit larger than a child's toy - suitable to a adult's hand.
It is approximately 2½ x 3½ inches without tip.
Weight with tip is approximately 3 oz.
And it has a slightly textured surface.
I designed a button for this.
I added a JUMBO top which is about 1.5x in every direction:
It is approximately 5 x 3½ inches without tip.
Weight with tip is approximately 9 oz.
AIO Robotics PLA
For large top, wall thickness should be 6 lines=2.4mm,
For jumbo top, wall thickness should be 10 lines = 4mm,
this helps get the balance outward from the center.
Concentric bottom layers, and random z-seam.
If you follow these instructions, your top should spin well and be beautifully textured.
The large top business end will accept a standard Trompo Grande tip.
Tip fits very tight, and a (rubber?) hammer will be needed to seat it fully.
I have added a second model with no hole, for those who wish to fashion their own hole to accommodate different tips.
The jumbo top business end is designed for a custom tip that has a ¼" shank
½" long and a flange diameter of ½".