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60 mm Desk Grommet Pen Well With Cable Chimney
A pen well that drops into a standard 60 mm desk grommet hole. Lift out the stock grommet cap and press this in: it holds pens in the 72 mm-wide, six-cell ring, and a central 22 mm chimney still lets a charging cable come up through the desk. A 58.6 mm spigot with eight crush ribs (60.6 mm across the ribs) grips the hole, and a 45° conical seat centres on the hole edge. The spigot reaches about 16 mm down, so it suits desktops 16 mm or thicker.
608 Bearing Spinning Pen Carousel
An 84 mm wide, 50 mm tall pen and tool carousel with eight wedge bays and a 20 mm centre cup. A standard 608 bearing (8 x 22 x 7 mm) presses into a 22.05 mm pocket in the underside, so the carousel spins on any fixed 8 mm post, such as an M8 bolt standing in a scrap block or a piece of 8 mm rod.
Clip-On Notebook Pen Loop
This loop slides onto the edge of a notebook or planner cover and holds your pen along that edge. The spring jaws are 30 mm long and grip boards 1.5–3 mm thick, from card-cover journals to hardcovers. A split 10.5 mm ring grips 10–11.5 mm gel and ballpoint pens. The part is 43 x 15 x 30 mm, prints flat with no supports, and needs no glue or elastic band that can stretch out.
Business Card Stand With Pen Trough
This desk stand has a 92 mm wide card well tilted back 15°. It fits both US business cards (88.9 x 50.8 mm) and EU/ISO cards (85 x 55 mm), in stacks up to about 25 mm deep. The front has a thumb notch so you can pull out one card at a time, and a closed-end 12 mm pen trough keeps a pen from rolling off. The whole part measures 100 x 66 x 42 mm and needs no supports.
Desk-Side Screw-On Pen And Scissors Caddy
A caddy that screws to the side of a desk, pedestal or monitor shelf and keeps pens, scissors and a ruler within reach without using any desk space. It measures 124 x 25 x 42 mm and has two 13 mm pen wells, a 24 x 9 mm scissor-blade slot and a 34 x 4 mm ruler slot. Two side ears take #8 wood screws or M4 bolts through 4.6 mm holes.
Arm Clamp Pen Collar
This collar is part of the 'NEMA17 Hanging Wall Polargraph Drawbot' kit. It is a 34 mm OD x 10 mm knurled ring, and its 22.4 mm bore slides over the gondola hub's 22 mm pen sleeve to hold the two line arms in place. One M3 heat-set insert goes in a 4.0 mm radial bore in a flat 14 mm pad. An M3x16 thumbscrew in that insert passes through the sleeve slot to clamp the pen and lock the collar with one turn.
Ballast Gondola Pen Hub
This is the main gondola body for the 'NEMA17 Hanging Wall Polargraph Drawbot' kit. It is a 90 mm dia x 46 mm hub with a 22 mm OD pen sleeve and a 14 mm through-bore that takes pens 8–13.5 mm across. The sleeve sits on the axis of an annular ballast trough, which holds about 120–150 g of shot or coins to give steady pen pressure. The trough is closed by the kit's screw lid, fixed with three M3x8 screws into M3 heat-set inserts (4.0 mm bores) at r = 40 mm. A 3.6 mm slot in the sleeve lets the collar's M3x16 screw clamp the pen, and a 1 mm chamfer on the base helps it glide over paper.