Bento Mini Cradle for Sunlu S4 Filament Dryer

This is  cradle for using thrutheframe's Bento mini in the Sunlu S4 filament dryer. 

It is recommended to print using ABS/ASA, although you might just get away with PLA if you only run the S4 at 50-55°C.

It is a fairly tight fit so that the Bento mini is held in place via friction. It has a small cable guide for the fan cable.

The two spools next to the Bento mini will touch the Bento. The spools should still turn, but some printers might have problems with the increased resistance.

The fan can be powered by splicing into the cables for one of the existing fans (these can be accessed by removing the base), and the cable can be routed through one of the small ventilation slots to the side of the rollers.

Note the S4 fans are 12v fans so you will need to source a 12v 6028 blower fan - which are readily available.

The S4 fans plug into a JST-PH (2mm pitch) socket on a pcb on the back of the LCD, so a less destructive method for connection would be to create a suitable splitter cable. I created a y splitter from a JST-PH plug to JST-PH and JST-ZH sockets, and a JST-ZH plug to JST-XH socket cable: the JST-ZH is small enough to fit through the ventilation slots, and the 6028 blower fans typically come with a JST-XH plug.

Getting to the pcb is however something of a faff, as you need to dismantle the entire S4. In summary the procedure is:

1. remove the four screws on the back of the S4 around the panel with the power switch and cable socket (usual caveats about working around 120/220v AC transformers)
2. Remove the two spade connectors for the wires connecting the power switch/socket panel to the transformer
3. Remove the base of the unit - this is held in place with 7 screws, one of which might be under the serial number sticker
4. With the S4 upside down, there are four large screws in the corners of the part with the rollers, fans, etc. which need to be removed
5. There are also five screws near the base of the unit, at the front holding the window in place which also need to be removed.
6. With the unit the right way up, there are four screws near the top holding the window in place, and two more down the sides near the rollers.
7. With all the screws removed the only thing holding the front window is the trim around the LCD which is held in place with plastic clips. Carefully remove this (e.g. with a plastic scribe)
8. With the window removed you should now be able to access 5 screws above the lcd panel
9. At this point you should be able to separate the part containing the rollers/fans/heater etc. from the rest of the case
10. You should now be able to access the four screws holding the lcd in place

Different cradle designed for using the Bento mini in the Sunlu S4 Filament Dryer.