It's not that simple.
Nowadays, probably 100% of spin dryers are direct drive and the motor dimensioning ratio (height x width) has changed a lot over the years to make it as compact as possible, some "dead" space is needed so the motor can move freely together with the drum (suspension).
Adding a pump, (electrica or motor driven) is unthinkable because it will add several milimeters to the height, making the hwole product taller, doing that, we can't fit another row in the container and this incraeses the logistics costs (factory-distributor-retailer) Only this automatically adds $100 to $150 (US Dollars) to the retail price.
After that, there's "how the retailer is going to deliver the product to the final consumer". If it's a physical store, that's not ahuge issue. the customer buys a spin dryer, toss it in the trunk of back sead and drive home. If it's an online retailer, there's the retailer-final consumer shipping cost. For an ordinary person using FedEx services, that's not a big deal because there's no huge differences. Now when it's a company that ships thousands of parcels per month and obviously nave a "corporate" contract with the shipping companies, everything is meticulously studied. I mean, I know what is having to work side by side with a FedEx engineer to design the Nina Soft spin dryer packaging. The "encourage" (they actually force us) to optimize our designs in millimeters. Literally, every millimeter counts and 1 millimeter on the height or width or "half gram" can be a huge difference for their internal system and that can cost us $10 or $20 more PER MILIMETER.
That said: Making a spin dryer with a pump is one of my dreams. Until a few months ago we had a model (Mega) that I made with the option to have a gravity drain (but that would require the user to purchase a regular washing machine drain hose) I couldn't include the hose because of 25 grams that would cost $75 more to ship each unit. Many parts I'd love to make sturdier, to make the products last much longer, but that adds weight.
If I made the spin dryers exactly like I want (i hate that container to collect the water), we wouldn't sell any, because all the logistics would make it cost almost the same as a full size front load washer. Nobody would buy it.
Add to that the market demanding mugh bigger capacities and at the same time they want the products every time smaller, to save space.
Some customers send us messages giving us suggestions to basically transform our products into TARDIS. Some of the messages are laughable, for example tah customer that gave us one star on Amazon because the WonderWash was a "scam" because she tried to wash a cal king comforter and the comporter was 3x migger than the whole washer. In her comments she literally asked us "how dare you put on the market a washing machine that can't wash a cal king comforter".
Very few manufacturers around the World that still have spin dryers with pumps usually have them costing average 100% more (in some cases 150% more) than the same model without a pump.
This week I finished the diaper washer and started working on another project, a mini front load washer. The nightmare begins again. STP files going back and forth to FedEx, so they can "help me" optimize every millimeter and every gram of it. I'm having "the" nightmare to get rid of the concrete blocks and replace them by ballast tanks and making the tachometer extremely accurate (which translates to PITA super long waiting times before each spin) because the washer obvioulsy can't jump or walk at all, and we're limited to 5% of the counterweight load, plus the suspension system has to be "lighteneded" because the shocks and springs also add weight to the product. The target is making the washer shipping weight BELOW 19kg. It's so desperating that even the user manual is weighted and we have to reduce fonts to reduce the number of pages, change paper gramature and even the staple to see if we can reduce 1 gram.
Years ago, my best friend was a caliper. Nowadays my most important tool (after the computer) is a precision scale. It won't surprise me if in some years FedEx starts using microns instead of millimeters and carats instead of grams.
