Kids Routine Board With a One-Sweep Reset – Slide Each Task to Done, Captive Keys, Swap the Cards

ResetRail is a printed routine board for children: one captive slider key per task row next to a paper task card. The child slides the key across to the check when the task is done; it clicks into place at both ends. In the evening a parent sweeps the full-height rail across the board once and every key is back at to-do - no moving tasks back one by one. Cards slide in from the left edge, so a routine can change without reprinting anything; a printable card sheet with pictograms (and blank cards) is included. For the fridge (magnetic tape) or the wall (keyholes); 4, 6 or 7 tasks.

Validation status (please read): designed and checked in CAD (sweep reaches every key, key captivity, click geometry) and in the slicer (no supports). It has not been physically printed, assembled or tested; click, sweep and fridge-hold forces are calculations. All images are renders of the exported CAD; the fridge, kitchen and table are generic props, and the cards show the included card sheet - none is a photograph.

Features

• One sweep resets every row: the rail pushes every done key home, and each key clicks into its to-do end (checked on the CAD).

• Captive keys: each key is one piece, held in its channel by a foot wider than the slot. After assembly a lock bar between the cards and the keys hooks into the back tray, slides 3 mm down and latches; with the board assembled it blocks every key's head and neck, so a key only comes out if the lock bar is taken off (checked on the CAD; calculated pull-out about 52 N per lock-bar post). No loose magnets or tiles.

• Clear clicks at to-do and done: a printed spring finger in the tray holds a key (calculated about 1.5 N; a push of about 2.1 N moves it). Keys slide freely in between and stop at hard end stops.

• Cards you can change: 60 x 24 mm paper cards slide in from the left edge behind a framed window, with a 2 mm tab to pull them. Card sheet with 10 pictograms + blank cards included (PDF / SVG).

• Fridge or wall: four short pieces of 25 mm self-adhesive magnetic tape on marked pads on the back (needs a magnetic steel door - many stainless doors are not), or two keyholes.

Sizes

4 rows 158 x 142 mm; 6 rows 158 x 198 mm; 7 rows 158 x 209 mm; about 13 mm deep. Rows are 25 mm apart. 8 rows do not fit a 220 mm bed - use two boards (e.g. morning and evening).

Which files?

• Ready-to-print PrusaSlicer projects per size - 6 rows: resetrail_complete (3 beds) or resetrail_A_tray, _B_plate, _C_knobs_rail; 4 rows: resetrail_rows4_*; 7 rows: resetrail_rows7_*.

• STL files: tray, plate, rail and lock bar for each size, and the key (same for all sizes).

• ResetRail_task_cards_A4.pdf / .svg and ResetRail_blank_cards_A4.svg - print at 100 % on card of about 160 g/m² or more (or laminate).

• model.py - the CadQuery source: rows, pitch, travel, card size and click geometry; it re-checks every interface for a new set.

Print settings

• PLA - the click fingers are sized for PLA's stiffness (PETG would click at about 60 % of the force). Body colour for the tray and plate, an accent colour for the keys, rail and lock bar (one filament swap).

• 0.4 mm nozzle, 0.20 mm layers, no supports, parts as placed in the projects (the lock bar on its side with a 4 mm brim). Use elephant's-foot compensation - the tray's spring fingers stand on the bed next to narrow gaps.

• 6-row board: about 121 g and about 10 h 06 min over three plates (tray ~4 h 23 min, plate ~3 h 27 min, keys + rail + lock bar ~2 h 16 min); 4 rows about 7 h 31 min; 7 rows about 10 h 33 min - PrusaSlicer estimates on a generic profile.

Assembly

1. Print plates A, B and C. Peel the brim off the lock bar and trim any brim left at its post ends.

2. Hold the front plate face up (or lay it across the open tray or two books). Push each key foot-first through a card window and slide it to about the middle of its slot.

3. Slide the rail's tongues into the two band grooves from the plate's right edge.

4. Put the tray on the table, open side up. Tuck the plate's hooked right edge under the lip of the tray's right wall, then lower the left side - the keys' feet drop into their channels.

5. Lock bar: hold it 3 mm higher than its final place, drop one post into the left end of each key slot, press it flat and slide it 3 mm down until the latch clicks into its notch. It is meant to stay (to take the board apart, lift the latch tip with a thin screwdriver and slide the bar up).

6. Cut the cards and slide them in from the left edge, picture side up, with the board upright.

7. Fridge: a 40 mm piece of 25 mm magnetic tape on each of the four marked pads. Wall: two 3-4 mm screws in the keyholes.

Use: the child slides a key from its card to the check when the task is done. To reset, push only the rail's centre pad to the left in one stroke while the other hand steadies the board, then slide the rail back to the right edge.

Limitations

• Not physically printed, assembled or tested. Click and sweep forces are beam calculations; real values depend on the print (a 0.1 mm deviation changes them by roughly 15 %).

• The calculated sweep (about 13 N for 6 rows) is more than four tape pieces hold sideways (about 8 N): swept one-handed, the board slides - steady it with the other hand. The fridge hold needs a magnetic steel door.

• The keys are small parts, held only while the board is intact with the lock bar latched - check it from time to time and keep it out of reach of children under 3. Not a toy; no safety certification.

• Thin paper can sag between the card ribs - use card or laminate.

Pictures

Renders of the exported CAD, not photographs: the 6-row board on a fridge (cover), the one-sweep reset, a key at its check, the click inside the board, the card sheet, the parts, the three sizes, three colourways, the back and the board in a kitchen.